After analyzing hardness, meaning the material’s resistance to penetration and surface…
Steel certificates 2.1, 2.2, 3.1, 3.2: what really changes
When evaluating steel quality, the certificate is one of the most important elements. However, not all certificates are the same. The designations 2.1, 2.2, 3.1 and 3.2, defined by the EN 10204 standard, indicate different levels of control, traceability and material reliability. Understanding these differences is essential to correctly assess a material and its quality level.
🧠 Classification: two different approaches
The EN 10204 standard defines inspection documents for metallic products.
These are divided into two main categories:
🔹 Non-specific inspection certificates
🔹 Specific inspection certificates
👉 The difference is substantial:
in the first case, they are general declarations, while in the second they are actual test results performed on the supplied material.
🔍 Non-specific inspection certificates
These certificates confirm product compliance, but without linking results to tests performed on the specific supplied batch.
📄 Steel certificate 2.1 – Declaration of compliance
- Issued by: manufacturer
- Content: declaration that the product complies with the order
- Tests: ❌ none
👉 This is the most basic level.
Level of guarantee: low
👉 based solely on the manufacturer’s declaration
⚠️ Note: Bonomi Acciai does not issue 2.1 certificates
📄 Steel certificate 2.2 – Test report
- Issued by: manufacturer
- Content: declaration + test results
- Tests: ✔ present, but not specific
👉 The data is real, but comes from standard production controls performed on representative samples, not necessarily from the specific supplied material
Level of guarantee: moderate
✔ higher transparency compared to 2.1
✔ presence of measured data
👉 BA issues 2.2 certificates as standard
🧪 Specific inspection certificates
Here the level changes completely.
📄 Steel certificate 3.1 – Specific inspection
- Issued by: manufacturer
- Signed by: independent representative from production
- Tests: ✔ performed according to standards or specifications
👉 Results are linked to:
- heat
- batch
- identified samples
Level of guarantee: high
✔ official data
✔ traceability
✔ verified compliance
👉 BA regularly issues 3.1 certificates
📄 Steel certificate 3.2 – Third-party inspection
- Issued by: manufacturer and third-party body/customer
- Tests: ✔ specific
- Validation: ✔ double
👉 The certificate is also verified by an independent body
Level of guarantee: very high
✔ maximum reliability
✔ external verification
⚠️ Note: BA does not issue 3.2 certificates
DIFFERENCE
| Certificate | Tests | Specific | Control | Guarantee |
|---|---|---|---|---|
| 2.1 | ✕ | ✕ | Declaration | Low |
| 2.2 | ✔ | ✕ | Internal | Medium |
| 3.1 | ✔ | ✔ | Independent internal | High |
| 3.2 | ✔ | ✔ | Third party | Very high |
🔍 What this really means
The difference between these certificates is not just documentary.
👉 It is a difference in:
- reliability
- traceability
- level of control
Each certificate reflects a different approach to material control and quality assurance.
🧠 The role of the certificate in steel quality
The certificate represents the first level in evaluating steel quality.
However, it is important to remember:
👉 the certificate does not generate data
👉 it collects it
Behind each value there is a system of:
- chemical analysis
- mechanical testing
- internal controls
which we will explore in upcoming articles.
🎯 Conclusion
Steel certificates 2.1, 2.2, 3.1 and 3.2 are not equivalent.
They represent different levels of control and guarantee.
Understanding these differences means being able to correctly interpret data and make informed decisions about steel quality.
Do you want to learn more about how steel inspections and controls are managed?
Contattact us to speak with our technical department.
